Draft control



Nov. 9, 1926. 1,606,421

C. V. HADJEFF ET AL l DRAFT CONTROL Filed Jan. 2'7, 1926 2 'sheets-smeg*h 1 1 f MV f I ||1 ,2 H WA n uw* 1W A; [im @im i y MIIILI /nyenO/"f Nov. 9 1926.

C; V. HADJEFF ET AL `.DRAFT CONTROL Filed Jan. 2'7, 1926 lil Patented Nov. 9, 1926.

.narran stares CHARLES v. HADJEF AND BERNARD BOLDA, QF Germ-inn, carleton.

DRAFT CONTROL.

Application led January v27', 1928. SerialNo. 4,078.

The object of our invention is to provide means Within the fire box `of domestic heating,l lunits and heat and steam generating plants of a more ei'iicient thermodynamic condition Within the fire box.

Still further objects of our invention consist in continiiig the heat `.zone of greatest intensity,l within the central partof the fire box and of the fuel beingconsuined for heat generating purposes.

Still further objects ofour invention is-to prevent the admission of lcold airenter'ing the lire bon-around the edges of the fire and to cool lthe heated air that has been heated by the same passing through the iire.`

Additional advantages of our invention consist inthe placing aroundithe-outeredge of the fire box and between y,the .ends of the grates andthe inner shell of the lire box-of a compressible fire resistant material that ivill compensate for the expansion and contraction of the grates and atthe saine time will prevent the free passage of the air therethrough. i

Additional advantages con-sist in `providing an air chainberthrough which the incoming air to be admitted int-o the fire box will'be preheated before the entrance of the same into the iirebox.

Additional advantages consist in providing ventilating holes being placed-through the support for the lire grates'to aidiin the control of the direction of iiovv of the incoming air and at the saine time to preheat the saine and to provide the. admission of the saine over an areaof some in'aofnitude.A

llVith these and incidental objects in view, the invention consists incertain novel Yfeatures of construction yand combination of parts, theessential elements of Which-are set forth in the appended claimsyand apreferred forni of embodiment of Which `is hereinafter shovvn with reference-to the drawings which accompany and formapart f this specification.

` Fi is a l side` elevation, partially; in Vsection of`avertical tnv-pe boiler, 'illustrating one 'of' our devices `in place-Within the firebox. l n

2' is*- ay perspective;'side-elevation `of one'of'thecircular eupportsupon which the gratos set, adapted for "disposition within the. fire bon,"i'vl'ieiein the jfire boxA is -ci-rciilar .in forni.

'Fi ers'-ectivefvieiv:ofia` arti-of Vgrate and the shell of the :fire boil.

Fig. 6 ,is a perspective vieiv, of a forni of the support, as adapted to a @tire-box of the rectangular form.

Like reference characters refer .to .lilre parts :throughout the :several views.

'l the shell of a boiler, 'having a rlre'bor; Y

2, disposed therein and having vertical ftlues 3, for the passage of the heated `gases and the products of combustion therethrough, around Whichthe medium to be heated is placed. Brackets et, are .placed Witliinvthe fire box and are secured .to the shell of the boiler by suitable -:t'astening means, as rivets 5, and having` a right angle .support 6, formed Von the upper end thereof, upon which the support 7, is secured. This support in `acircular form of Vfire boxrivould preferably be made of inoreithan one section. `Thesupport 7, rests on its lower 8, directly.uponthebraclret support 6 Aand is placed'in close proiiimity about its-outer grate secside periphery, totlie'inner shell of the. lire box,I

the same is preferablj7 formed in tivo sections, a 'lower sectionwS, and `theupper sec-` tion 9, and having webs 4l0, disposed therebetween to' maintain the upperand loiver section in spaced relationship. Free air passageopenings ll, are Vdisposedaround` the outer periphery ofwthe outerfsectiom through which the 'free airinay be permittedto pass. (The.freeair-passes between the 4upper and lower lsection and thence through the openings 1l disposed inthexupper section.

"Disposed-'upon the` upper sec-tion9.-of the Y support is-placed the grate' barsections 1Q g .the grate bars VAarepreferably made seine# what smaller,` in diameter than the, inner diainetergof `the"fire box.,- leaving a-'spaeethereriable, depending Auponthe relative temperatuies' AkZoff-the `giratesesetfi'onSand-'that oftlie iso lli:

Y perature.

shell of the fire box; as it will be apparent that if the grate section is heated to a fairly high temperature, the same will expand and if the fire box shell is of a fairly low temperature the same will be somewhat smaller in diameter than if heated to a high tem- Through the space 13,` which is a variable one, free air normally passes. To prevent the passage of free air therebetween and to compensate for the variableness of the space, we have provided a noncombustible flexible material member 14, which we have found gives best results as and when made of a iexible material. The side reinforcing walls are preferably made of mesh material having vertical and longitudinal section members and between which we place noncombustible material while in a plastic state, as asbestos, or other material that remains in a compressible state, while at high temperature and yet in a .somewhat porous condition, as is obtained in asbestos products or other similar noncombustible mineral products, this is shown at 15, and is preferably placed therein while in a plastic state. This is formed wedge shaped and is disposed around the end grate sectionand between the same and the fire box wall and rests directly upon the upper section of the supporting member 9, and directly above the opening 11,

provided for the passage of free air therebetween. The spaced relationship existing between the lower support member 8, and the upper support member 9, permits of the passage of the air therebetween, thus warming the same and the partial prevention of the free passage of the air through the action of the disposition of the compressible member 14, between the ends of the grates and the side walls of the fire box retards the free passage is further retarded due to the opening 11 within the upper support member, while maintaining a state of equilibrium or partial equilibrium between the air disposed below and there above has a tendency of retarding the draft and thus forcing the air to enter through the grate section and through the combustible material placed thereupon to be used for the generation of heat.

This same form of compressible material that is noncombustible, may be placed within any form of lire box, whether the s ame is used in a domestic cooking stove where hard fuel is used, or within the-fire box of a sta tionary steam generating plant, or within the fire box of a locomotive type boiler lire box and it is immaterial whether'the fire box is circular in construction, or whether the same is rectangular in form.

While the form of mechanism herein shown and describedV is admirably adapted to fulll the objects primarily stated, it is to be understood that it is not intended to confine the invention lto the one form 'of em.-

bodiment herein shown and described, as it is .susceptible of embodiment in various forms, all coming within the scope of the claims which follow.

What we claim is 1. In a draft control, the combination of a lire box, of a bracket disposed within the lire box, a support disposed upon the brachet composed of an upper and a lower section spaced apart with openings disposed about the outer periphery of the upper section, grates disposed upon said support and having the edges thereof spaced apart from the inner wall of the fire box, anda noncombustible filler disposed between the edges of said grates to be placed upon the support and the inner wall of the fire box, and resting upon the upper section of said support.

2. ln a draft control, the combination of a lire box, of a supporting member disposed within the tire box, composed of an upper and a lower supporting member spaced apart, air ports disposed upon the outer periphery of the upper supporting member, fire grates placed upon the support and spaced from the inner wall of the fire box and a compressible noncombustible filler member disposed between the grate and the inner wall of the tire box and placed above the ports of the upper member. Y v

3. In a draft control, the combinati-on of a fire box, of a supporting member disposed in a horizontal position within the fire box, bracket supports secured to the inner wall of the fire box and adapted to maintain the support in a fixed position, the supporting member composed of an upper and lower section and spaced apart byv webs, grate bars disposed upon the upper supporting section and spaced apart fromthe inner lire box wall, openings disposed through the upper support and connecting the space between the lower and upper support and adaptedV to discharge free air in the space between the grates and the inner fire box wall and a wedge shaped noncombustible compressible member disposed between the inner tire box wall and the ends of the grate bars and immediately above the openings for the passage of free air.

4. In a draft control, the combination of a tire box, of a grate supporting member having free air passages disposed therethrough adjacent the outer periphery of the grate support disposed within the lire box, grates disposed upon the grate support and spaced apart from the inner wall of the lire box, and a reinforced compressible, noncombustible member disposed between the grates and the inner wall of the fire box and being disposed above the free air passages through the grate support.

5. ln a draft control, the combination of a tire box, of a grate supporting member composed of an upper a lower section weefsel spaced apart and having free air passages adjacent he outer edges of the upper seotiou and passing therethrough, brackets secured Within the l're box and 'adapted to mantan the grate supports in ixed position, grates disposed upon the grace supports and s moed apart from the inner Walls of the re box, and a reinforced compressiu ble, noueombustble member disposed becweeuthe ends of the gratos and the .inner Walls of the hre box and above the 'free air passages disposed through the upper sooiiou of the grate supports.

CHARLES V. HADJEFF. BERNARD J'. BOLDA. 

